A translator must have an excellent, up-to-date knowledge of his source languages.He must fill facility in the handling of his target language, which will be his mother tongue or language of habitual __1__, and a knowledge and understanding of the latest subject-matter in his field of specialization. This is, as it were, his professional __2__. In addition to this, it is __3__ that he should have an enquiring mind, wide interests, a good memory and the ability to __4__ quickly the basic principles of new developments. He should be willing to work __5__ his own, often at high speeds, but should be humble enough to __6__ other people because his own __7__ does not always prove adequate to the task in hand. He should be able to type fairly quickly and __8__ and, if he is working mainly for publication, should have more than a nodding __9__ with printing techniques and proof-reading.If he is working basically as an information translator, let us say, for an industrial firms, he should have the flexibility of mind to enable him to __10__ rapidly from one source language to __11__, as well as from one subject-matter to another, since this ability is frequently __12__ of him in such work. Bearing in __13__ the nature of the translator's work, i.e. the processing of the written word, it is, strictly speaking, __14__ that he should be able to speak the languages he is __15__ with. If he does speak them, it is an __16__ rather than a hindrance(障碍), but this skill is in many ways a luxury that he can do away with. It is, __17__, desirable that he should have an __18__ idea about the pronunciation of his source languages, even if this is restricted to knowing how proper names and place names are pronounced. The same __19__ to an ability to write his source languages. If he can, well and good; if he cannot, it does not __20__.